I'm not going to comment on legal issues as that is the cause of most neighbour disputes. Frankly the law isn't really relevant as a nuisance is a nuisance whatever the law says.
Firstly - the canoe. The correct procedure if the sight of the canoe offended you would have been to ask nicely for it to be moved. Failing that, you could easily have found a way of masking it without your solution causing problems for your neighbour.
Secondly - your ( unwitting?) boundary terrorism. Planting anything on your boundary without your neighbours agreement which then imposes on your neighbour is frankly bad manners and inconsiderate. You may well like the vine and be willing to trim it regularly, but why should you demand that your neighbour is equally willing. You seem surprised that the subject is raised in your own home, but surely any such complaint is better at a social meeting that through a legal proceeding.
It's not about whether you have a right to plant a vine on the boundary, but whether it's reasonable, and it quite clearly isn't as far as your neighbour is concerned, which is pretty much the clincher.
If you have to ask whether you should remove a source of nuisance to your neighbour, then you obviously have no understanding of what being a good neighbour requires.